Electrical conductivity and thermopower of (1 - x) BiFeO(3) - xBi(0.5)K(0.5)TiO3 (x = 0.1, 0.2) ceramics near the ferroelectric to paraelectric phase transition

Physical Chemistry Chemical Physics : PCCP
E T WefringT Grande

Abstract

Ferroelectric BiFeO3 has attractive properties such as high strain and polarization, but a wide range of applications of bulk BiFeO3 are hindered due to high leakage currents and a high coercive electric field. Here, we report on the thermal behaviour of the electrical conductivity and thermopower of BiFeO3 substituted with 10 and 20 mol% Bi0.5K0.5TiO3. A change from p-type to n-type conductivity in these semi-conducting materials was demonstrated by the change in the sign of the Seebeck coefficient and the change in the slope of the isothermal conductivity versus partial pressure of O. A minimum in the isothermal conductivity was observed at ∼10(-2) bar O2 partial pressure for both solid solutions. The strong dependence of the conductivity on the partial pressure of O2 was rationalized by a point defect model describing qualitatively the conductivity involving oxidation/reduction of Fe(3+), the dominating oxidation state of Fe in stoichiometric BiFeO3. The ferroelectric to paraelectric phase transition of 80 and 90 mol% BiFeO3 was observed at 648 ± 15 and 723 ± 15 °C respectively by differential thermal analysis and confirmed by dielectric spectroscopy and high temperature powder X-ray diffraction.

References

Jan 15, 2011·Physical Review Letters·J SeidelR Ramesh
Oct 27, 2011·Physical Review Letters·S Farokhipoor, B Noheda

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Citations

Dec 8, 2016·Nature Communications·Sandra H SkjærvøSverre M Selbach
May 2, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Yani Zhao, Marek Cieplak
Sep 7, 2019·Journal of Synchrotron Radiation·Frederick MarltonJohn Daniels
Apr 11, 2020·Nature Communications·Andreja BencanTadej Rojac

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